ANTIMONY 



225 



These figures confirm his old results, and may be fairly combined with 

 them and with the percentages found by Cooke, as follows : 



Schneider, early series 28.520, .008 



Schneider, late series 28.541, .0024 



Cooke 28.5182, .0120 



General mean 28.5385, =b .0023 



In 1881 Pfeifer * determined electrolytically the direct ratios between 

 silver and antimony, and copper and antimony. With copper the fol- 

 lowing data were obtained : 



G/ 



1.412 grm, 



1.902 



3.367 



Sb = 1.1008 Cu. 

 1.4832 " 

 2.6249 " 



Sb} : : IOO 

 128.270 

 128.236 

 128.272 



If Cu = 63.6, Sb = 122.36. 

 With silver he found 



5.925 grm. Sb= 15.774 Ag. 



6.429 

 10.116 



4 865 

 4.390 

 9.587 

 4.525 



17.109 

 26.972 

 13.014 

 11.697 

 25.611 

 12.097 



Mean, 128.259, .0077 



Ag^ : Sb : \ 100 : ,r. 

 37.562 

 37-577 

 37.506 

 37.383 

 37-531 

 37.433 

 37.406 



Mean, 37.485, d= .0198 



If Ag = 108, Sb == 121.45. 



The latter ratio was also determined by Popper, f several years after- 

 wards. The two metals were precipitated simultaneously by the same 

 current ; and in some experiments two portions of antimony were thrown 

 down against one of silver. These are indicated in the subjoined table 

 by suitable bracketing, and the ratio is given in the third column : 



* Ann. Chem. Pharm., 209, 161. 

 t Ann. Chem., 233, 153. 



15 



